This study compares new oral Nicotine Replacement Therapy (NRT) products containing 2 and 4 mg nicotine with NiQuitin™ lozenge 2 mg and 4 mg, after 12 hours of nicotine abstinence, with respect to nicotine pharmacokinetics, during 12 hours after start of administration. Single doses of treatment A, B, C, and D are given once in the morning during separate treatment visits scheduled in a crossover setting with randomized treatment sequences, also including a fifth treatment visit with either treatment E or F. The study will include 104 healthy smokers between the ages of 19 and 50 years, who have been smoking at least 10 cigarettes daily during at least one year preceding inclusion. The study will be performed at two sites with 52 subjects at each site. Subjects and study personnel will be aware of which treatment is administered at a given visit.